Selective three dimensional excitation for magnetic resonance ap

Details Selective three dimensional excitation for magnetic resonance ap Selective three dimensional excitation for magnetic resonance ap

1992-04-10

1993-12-14

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01R 3320

Patent

active

052706532

ABSTRACT:
A method of selectively exciting nuclear spins in a limited three-dimensional volume comprising the steps of applying a plurality of subpulses in the presence of three orthogonal magnetic gradients (G.sub.x, G.sub.y, G.sub.z) over a period of time to define a k-space trajectory including a plurality of stacked two-dimensional k-space spirals arranged in pairs with each pair having an outward spiral and an inward spiral, the steps of one spiral to the next spiral corresponding to gradient pulses (G.sub.z) alternately at the edge and at the origin of each k-space spiral plane. The selective three-dimensional excitation pulse can be used with a non-selective 90.degree. pulse to the volume prior to applying the plurality of RF subpulses and allowing nuclear spins in the volume to precess, then applying the plurality of RF subpulses to selectively refocus nuclear spins in the volume, and detecting and echo signal. The selective three-dimensional excitation pulse can be used also to tag nuclear spins of moving fluid such as blood in the volume and detecting echo signals from the tagged nuclear spins in a selective inversion recovery angiography method for coronary artery imaging.

REFERENCES:
patent: 4748410 (1988-05-01), Macovski
patent: 5105152 (1992-04-01), Pauly
patent: 5122747 (1992-06-01), Riederer et al.

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